CN202119966U

CN202119966U - Image capturing lens

Info

Publication number: CN202119966U
Application number: CN201120239418XU
Authority: CN
Inventors: 汤相岐; 周明达
Original assignee: Largan Precision Co Ltd
Current assignee: Largan Precision Co Ltd
Priority date: 2011-04-15
Filing date: 2011-07-01
Publication date: 2012-01-18
Anticipated expiration: 2021-07-01
Also published as: US8441745B2; TWI416196B; CN102736223B; US20120262804A1; CN102736223A; TW201241501A

Abstract

An image capturing lens includes, in order from an object side to an image side, a front lens group, an aperture stop, and a rear lens group. The front lens group comprises a first lens element with negative refractive power, and the rear lens group comprises a second lens element with positive refractive power, a third lens element with positive refractive power and a fourth lens element with negative refractive power in sequence from the object side to the image side. The object side surface of the first lens is a concave surface, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface. The fourth lens element has a concave object-side surface and a convex image-side surface, and at least includes an aspheric surface. By adjusting the curvature radius of the object-side surface and the image-side surface of the first lens element and the focal points of the image capturing lens and the third lens element, the total length of the image capturing lens can be effectively shortened, the aberration can be corrected, and good imaging quality can be obtained.

Description

Image acquisition lens

Technical field

The utility model relates to a kind of optical lens, particularly a kind of image acquisition lens that is applied to portable electronic devices.

Background technology

Recent years, along with the rise of the portable electronic product with camera function, the demand of miniaturization phtographic lens day by day improves; And the photo-sensitive cell of general phtographic lens is nothing more than being sensitization coupling element (Charge Coupled Device; And progressing greatly CCD) or two kinds of complementary matal-oxide semiconductor elements (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor), along with semiconductor process techniques; Make the picture element dimension shrinks of photo-sensitive cell; The miniaturization phtographic lens is the development toward high picture element field gradually, therefore, and to the also increase day by day of requirement of image quality.

Existing high-resolution phtographic lens adopts preposition aperture more and is the lens combination of four pieces of formulas, wherein; First lens and second lens often bind mutually with two pieces of glass spherical mirrors and become doublet (Doublet Lens), in order to color difference eliminating, like United States Patent (USP) the 7th; 365; Shown in No. 920, but above-mentioned phtographic lens causes the optics total length of system to be difficult for shortening because of too much spherical mirror configuration makes degree of freedom in system not enough.Moreover the technology that glass mirror binds is difficult for, and causes the difficulty in the manufacturing.In addition; Along with the size of sampling image lens is more done littler; And specification is more done higher; Do in limited space closely that lens set is upright will to be caused unnecessary light in lens barrel, repeatedly to reflect easily and influence lens imaging, therefore, non-essential light should avoid getting into imaging region to keep image quality.

The utility model content

For in response to the market demand and improve the existing in prior technology problem, the utility model provides a kind of image acquisition lens, can effectively shorten the optics total length, revises aberration and obtain favorable imaging quality.

To achieve these goals, the utility model provides an a kind of embodiment of image acquisition lens, along the thing side of an optical axis to comprising in regular turn as side:

One pre-group mirror group, extremely included in regular turn as side by the thing side: one has first lens of negative refracting power, and the thing side of these first lens is a concave surface;

One aperture; And

One back group mirror group, this back crowd's mirror group is extremely included again as side by the thing side in regular turn:

One has second lens of positive refracting power, and the thing side of these second lens is a concave surface, these second lens be convex surface as the side;

One has the 3rd lens of positive refracting power; And

One has the 4th lens of negative refracting power, and the thing side of the 4th lens is a concave surface, the 4th lens be convex surface as the side, the thing side of the 4th lens and the 4th lens be aspheric surface as one of them face of side;

Wherein, on this optical axis, the thing side of these first lens has a radius of curvature R ₁, these first lens have a radius of curvature R as the side ₂, this image acquisition lens has a focal distance f, and the 3rd lens have a focal distance f ₃, and satisfy following formula:

(formula 1) :-3.0＜R ₁/ R ₂＜0.9; And

(formula 2): 1.2＜f/f ₃＜2.0.

Above-mentioned image acquisition lens, wherein, the 3rd lens be convex surface as the side, the thing side of the 4th lens and the 4th lens be aspheric surface as the side, the 4th lens have at least one point of inflexion, and the 4th lens are plastic lens.

Above-mentioned image acquisition lens, wherein, the thing side of the 3rd lens has a radius of curvature R ₅, the 3rd lens have a radius of curvature R as the side ₆, this image acquisition lens satisfies following formula: 0.1＜(R ₅+ R ₆)/(R ₅-R ₆)＜0.8.

Above-mentioned image acquisition lens, wherein, the thing side of the 4th lens has a radius of curvature R ₇, the 4th lens have a radius of curvature R as the side ₈, this image acquisition lens satisfies following formula: 0.1＜R ₇/ R ₈＜0.8.

Above-mentioned image acquisition lens, wherein, the 3rd lens have a chromatic dispersion coefficient V ₃, the 4th lens have a chromatic dispersion coefficient V ₄, this image acquisition lens satisfies following formula: 23＜V ₃-V ₄＜45.

Above-mentioned image acquisition lens wherein, on this optical axis, has a mirror spacing T between the 3rd lens and the 4th lens ₃₄, the 4th lens have a thickness C T ₄, this image acquisition lens satisfies following formula: 0.15＜T ₃₄/ CT ₄＜1.5.

Above-mentioned image acquisition lens, wherein, on this optical axis, this image acquisition lens has a focal distance f, and these second lens have a focal distance f ₂, this image acquisition lens satisfies following formula: | f/f ₂|＜0.20.

Above-mentioned image acquisition lens; Wherein, This image acquisition lens also includes an imaging surface, and on this optical axis, this aperture to this imaging surface has one apart from SL; The thing side of these first lens to this imaging surface has one apart from TTL, and this image acquisition lens satisfies following formula: 0.5＜SL/TTL＜0.9.

Above-mentioned image acquisition lens, wherein, the 3rd lens have a chromatic dispersion coefficient V ₃, the 4th lens have a chromatic dispersion coefficient V ₄, this image acquisition lens satisfies following formula: 30＜V ₃-V ₄＜42.

Above-mentioned image acquisition lens, wherein, on this optical axis, these first lens have a thickness C T ₁, these second lens have a thickness C T ₂, this image acquisition lens satisfies following formula: 0.2＜CT ₂/ CT ₁＜1.0.

Above-mentioned image acquisition lens, wherein, the thing side of these first lens has a radius of curvature R ₁, these first lens have a radius of curvature R as the side ₂, this image acquisition lens satisfies following formula :-1.1＜R ₁/ R ₂＜0.7.

Above-mentioned image acquisition lens, wherein, the thing side of the 3rd lens has a radius of curvature R ₅, the 3rd lens have a radius of curvature R as the side ₆, this image acquisition lens satisfies following formula: 0.25＜(R ₅+ R ₆)/(R ₅-R ₆)＜0.55.

Above-mentioned image acquisition lens, wherein, these first lens have at least one point of inflexion.

Above-mentioned image acquisition lens, wherein, the 3rd lens have a radius of curvature R as the side ₆, the thing side of the 4th lens has a radius of curvature R ₇, this image acquisition lens satisfies following formula: 0.3＜R ₇/ R ₆＜0.8.

To achieve these goals, the utility model also provides a kind of another embodiment of image acquisition lens, along the thing side of an optical axis to comprising in regular turn as side:

One has first lens of negative refracting power, and the thing side of these first lens is a concave surface;

One second lens, the thing side of these second lens is a concave surface;

One has the 3rd lens of positive refracting power; And

One has the 4th lens of negative refracting power, the thing side of the 4th lens and the 4th lens be aspheric surface as one of them face of side;

Wherein, the thing side of these first lens has a radius of curvature R ₁, these first lens have a radius of curvature R as the side ₂, this image acquisition lens has a focal distance f, and these second lens have a focal distance f ₂, this image acquisition lens also includes an aperture and an imaging surface, and on this optical axis, this aperture to this imaging surface has one apart from SL, and the thing side of these first lens to this imaging surface has one apart from TTL, and this image acquisition lens satisfies following formula:

(formula 1) :-3.0＜R ₁/ R ₂＜0.9;

(formula 3): | f/f ₂|＜0.35; And

(formula 4): 0.5＜SL/TTL＜0.9.

Above-mentioned image acquisition lens, wherein, the thing side of the 4th lens is a concave surface, the 4th lens be convex surface as the side, the thing side of the 4th lens and the 4th lens be aspheric surface as the side.

Above-mentioned image acquisition lens, wherein, these second lens be convex surface as the side.

Above-mentioned image acquisition lens, wherein, the 4th lens have at least one point of inflexion.

Above-mentioned image acquisition lens, wherein, these second lens have positive refracting power.

The effect of the utility model is; According to the image acquisition lens that the utility model disclosed; First lens with negative refracting power can enlarge the field angle of image acquisition lens; When the thing side of first lens is concave surface, can help to strengthen the configuration of the negative refracting power of first lens, and then increase the field angle of image acquisition lens.Second lens with positive refracting power can provide the refracting power of image acquisition lens and revise aberration, when the thing side of second lens is concave surface, when being convex surface as the side, can helps to revise the aberration of image acquisition lens.The 3rd lens with positive refracting power can effectively shorten the optics total length of image acquisition lens, and with the 4th lens with negative refracting power form one positive one negative, each item aberration that can further revise image acquisition lens and produced.When the 3rd lens be convex surface as the side time, can help to revise the astigmatism of image acquisition lens.When the thing side of the 4th lens is concave surface, when being convex surface as the side, can helps to revise the higher order aberratons of image acquisition lens.

When above-mentioned in satisfying (formula 1), the thing side of first lens with have suitable radius-of-curvature as the side, help the spherical aberration (Spherical Aberration) of revisal image acquisition lens.When above-mentioned in satisfying (formula 2), the 3rd lens have more suitable refracting power, can help the correction of aberration.When above-mentioned in satisfying (formula 3), second lens have more suitable refracting power, can effectively control the aberration of image acquisition lens, promote image quality, also can reduce the optical sensitive degree of image acquisition lens.When above-mentioned in satisfying (formula 4), aperture has suitable position, can effectively shorten the optics total length, and in the heart far away and wide-angle characteristic, obtains best balance.

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in detail, but not as the qualification to the utility model.

Description of drawings

Figure 1A is the first example structure synoptic diagram according to the image acquisition lens that the utility model disclosed;

Figure 1B is incident in the longitudinal spherical aberration curve synoptic diagram of the image acquisition lens that Figure 1A discloses for the light of wavelength 486.1nm, 587.6nm and 656.3nm;

Fig. 1 C is the astigmatism curvature of field curve synoptic diagram that the light of wavelength 587.6nm is incident in the image acquisition lens that Figure 1A discloses;

Fig. 1 D is the distortion curve synoptic diagram that the light of wavelength 587.6nm is incident in the image acquisition lens that Figure 1A discloses;

Fig. 2 A is the second example structure synoptic diagram according to the image acquisition lens that the utility model disclosed;

Fig. 2 B is the longitudinal spherical aberration curve synoptic diagram that the light of wavelength 486.1nm, 587.6nm and 656.3nm is incident in the image acquisition lens that Fig. 2 A disclosed;

Fig. 2 C is the astigmatism curvature of field curve synoptic diagram that the light of wavelength 587.6nm is incident in the image acquisition lens that Fig. 2 A disclosed;

Fig. 2 D is the distortion curve synoptic diagram that the light of wavelength 587.6nm is incident in the image acquisition lens that Fig. 2 A disclosed;

Fig. 3 A is the 3rd example structure synoptic diagram according to the image acquisition lens that the utility model disclosed;

Fig. 3 B is the longitudinal spherical aberration curve synoptic diagram that the light of wavelength 486.1nm, 587.6nm and 656.3nm is incident in the image acquisition lens that Fig. 3 A disclosed;

Fig. 3 C is the astigmatism curvature of field curve synoptic diagram that the light of wavelength 587.6nm is incident in the image acquisition lens that Fig. 3 A disclosed;

Fig. 3 D is the distortion curve synoptic diagram that the light of wavelength 587.6nm is incident in the image acquisition lens that Fig. 3 A disclosed;

Fig. 4 A is the 4th example structure synoptic diagram according to the image acquisition lens that the utility model disclosed;

Fig. 4 B is the longitudinal spherical aberration curve synoptic diagram that the light of wavelength 486.1nm, 587.6nm and 656.3nm is incident in the image acquisition lens that Fig. 4 A disclosed;

Fig. 4 C is the astigmatism curvature of field curve synoptic diagram that the light of wavelength 587.6nm is incident in the image acquisition lens that Fig. 4 A disclosed;

Fig. 4 D is the distortion curve synoptic diagram that the light of wavelength 587.6nm is incident in the image acquisition lens that Fig. 4 A disclosed;

Fig. 5 A is the 5th example structure synoptic diagram according to the image acquisition lens that the utility model disclosed;

Fig. 5 B is the longitudinal spherical aberration curve synoptic diagram that the light of wavelength 486.1nm, 587.6nm and 656.3nm is incident in the image acquisition lens that Fig. 5 A disclosed;

Fig. 5 C is the astigmatism curvature of field curve synoptic diagram that the light of wavelength 587.6nm is incident in the image acquisition lens that Fig. 5 A disclosed;

Fig. 5 D is the distortion curve synoptic diagram that the light of wavelength 587.6nm is incident in the image acquisition lens that Fig. 5 A disclosed;

Fig. 6 A is the 6th example structure synoptic diagram according to the image acquisition lens that the utility model disclosed;

Fig. 6 B is the longitudinal spherical aberration curve synoptic diagram that the light of wavelength 486.1nm, 587.6nm and 656.3nm is incident in the image acquisition lens that Fig. 6 A disclosed.

Fig. 6 C is the astigmatism curvature of field curve synoptic diagram that the light of wavelength 587.6nm is incident in the image acquisition lens that Fig. 6 A disclosed;

Fig. 6 D is the distortion curve synoptic diagram that the light of wavelength 587.6nm is incident in the image acquisition lens that Fig. 6 A disclosed;

Fig. 7 A is the 7th example structure synoptic diagram according to the image acquisition lens that the utility model disclosed;

Fig. 7 B is the longitudinal spherical aberration curve synoptic diagram that the light of wavelength 486.1nm, 587.6nm and 656.3nm is incident in the image acquisition lens that Fig. 7 A disclosed;

Fig. 7 C is the astigmatism curvature of field curve synoptic diagram that the light of wavelength 587.6nm is incident in the image acquisition lens that Fig. 7 A disclosed;

Fig. 7 D is the distortion curve synoptic diagram that the light of wavelength 587.6nm is incident in the image acquisition lens that Fig. 7 A disclosed;

Fig. 8 A is the 8th example structure synoptic diagram according to the image acquisition lens that the utility model disclosed;

Fig. 8 B is the longitudinal spherical aberration curve synoptic diagram that the light of wavelength 486.1nm, 587.6nm and 656.3nm is incident in the image acquisition lens that Fig. 8 A disclosed;

Fig. 8 C is the astigmatism curvature of field curve synoptic diagram that the light of wavelength 587.6nm is incident in the image acquisition lens that Fig. 8 A disclosed;

Fig. 8 D is the distortion curve synoptic diagram that the light of wavelength 587.6nm is incident in the image acquisition lens that Fig. 8 A disclosed.

Wherein, Reference numeral

10,20,30,40,50,60,70,80 image acquisition lens

100,200,300,400,500,600,700,800 apertures

110,210,310,410,510,610,710,810 first lens

111,211,311,411,511,611,711,811 first lens thing sides

112,212,312,412,512,612,712,812 first lens are as the side

113,213,313,413,513,613,713,813 first points of inflexion

120,220,320,420,520,620,720,820 second lens

121,221,321,421,521,621,721,821 second lens thing sides

122,222,322,422,522,622,722,822 second lens are as the side

130,230,330,430,530,630,730,830 the 3rd lens

131,231,331,431,531,631,731,831 the 3rd lens thing sides

132,232,332,432,532,632,732,832 the 3rd lens are as the side

140,240,340,440,540,640,740,840 the 4th lens

141,241,341,441,541,641,741,841 the 4th lens thing sides

142,242,342,442,542,642,742,842 the 4th lens are as the side

143,243,343,443,543,643,743,843 second points of inflexion

150,250,350,450,550,650,750,850 infrared filters

160,260,360,460,560,660,760,860 imaging surfaces

162,262,362,462,562,662,762,862 Image Sensors

Embodiment

According to the image acquisition lens that the utility model disclosed; Do an explanation for example with Figure 1A earlier; To explain that having identical lens among each embodiment forms and configuration relation; And the formula that has identical image acquisition lens among each embodiment is described, and other different part will be described in detail in each embodiment.

With Figure 1A is example, and image acquisition lens 10 is included by thing side to the picture side (like Figure 1A from left to right) of optical axis in regular turn:

One has first lens 110 of negative refracting power, can enlarge the field angle of image acquisition lens 10.First lens 110 comprise one be concave surface the first lens thing side 111 and one first lens as side 112.When the first lens thing side 111 is concave surface, can helps to strengthen the configuration of first lens, 110 negative refracting powers, and then increase the field angle of image acquisition lens 10.Wherein, first lens 110 can have at least one point of inflexion, such as but not limited to 2 first points of inflexion 113, can suppress the angle of incidence of light degree from the axle visual field effectively, and can further revise aberration.

One has second lens 120 of positive refracting power, the refracting power of image acquisition lens 10 can be provided and revise aberration.Second lens 120 comprise one for the second lens thing side 121 of concave surface and one for second lens of convex surface as side 122, can help to revise the aberration of image acquisition lens 10.

One has the 3rd lens 130 of positive refracting power, can effectively shorten the optics total length of image acquisition lens 10.The 3rd lens 130 comprise that the 3rd lens that one the 3rd lens thing side 131 and is convex surface are as side 132, to revise astigmatism effectively.

One has the 4th lens 140 of negative refracting power, comprise one be concave surface the 4th lens thing side 141 and be convex surface the 4th lens as side 142, can be beneficial to the higher order aberratons of revisal image acquisition lens 10.The material of the 4th lens 140 is plastics, and the 4th lens thing side 141 and the 4th lens are aspheric surface as side 142.Wherein, the 4th lens 140 can have at least one point of inflexion, such as but not limited to 2 first points of inflexion 143, can suppress the angle of incidence of light degree from the axle visual field effectively, and can further revise aberration.

Image acquisition lens 10 according to the utility model disclosed can satisfy following formula:

(formula 1) :-3.0＜R ₁/ R ₂＜0.9

(formula 2): 1.2＜f/f ₃＜2.0

Wherein, R ₁Be the radius-of-curvature of the first lens thing side 111, R ₂Be the radius-of-curvature of first lens as side 112, f is the focal length of image acquisition lens 10, f ₃It is the focal length of the 3rd lens 130.

When above-mentioned in satisfying (formula 1), make the first lens thing side 111 and first lens have suitable radius-of-curvature, help the spherical aberration (Spherical Aberration) of revisal image acquisition lens 10 as side 112.Wherein, the optimum range of above-mentioned (formula 1) can be-1.1＜R ₁/ R ₂＜0.7.When above-mentioned in satisfying (formula 2), the 3rd lens have more suitable refracting power, can effectively shorten the optics total length of image acquisition lens 10.

Moreover image acquisition lens 10 also comprises an aperture 100.Aperture 100 can be arranged between first lens 110 and second lens 120, in the heart far away and wide-angle characteristic, obtains best balance.In addition, image acquisition lens 10 includes an infrared filter 150, an imaging surface 160 and an Image Sensor 162 in regular turn after the 4th lens 140.Wherein, Image Sensor 162 is to be arranged on the imaging surface 160, in order to receive the light that gets into image acquisition lens 10.

In addition, image acquisition lens 10 also can satisfy at least formula one of them:

(formula 3): | f/f ₂|＜0.35

(formula 4): 0.5＜SL/TTL＜0.9

(formula 5): 0.1＜(R ₅+ R ₆)/(R ₅-R ₆)＜0.8

(formula 6): 0.1＜R ₇/ R ₈＜0.8

(formula 7): 23＜V ₃-V ₄＜45

(formula 8): 0.15＜T ₃₄/ CT ₄＜1.5

(formula 9): 0.2＜CT ₂/ CT ₁＜1.0

(formula 10): 0.3＜R ₇/ R ₆＜0.8

Wherein, f ₂Be the focal length of second lens 120, on optical axis, SL is the distance between aperture 100 to the imaging surface 160, and TTL is the distance between first lens thing side 111 to the imaging surface 160, R ₅Be the radius-of-curvature of the 3rd lens thing side 131, R ₆Be the radius-of-curvature of the 3rd lens as side 132, R ₇Be the radius-of-curvature of the 4th lens thing side 141, R ₈Be the radius-of-curvature of the 4th lens as side 142, V ₃Be the abbe number of the 3rd lens 130, V ₄Be the abbe number of the 4th lens 140, T ₃₄Be the mirror spacing between the 3rd lens 130 and the 4th lens 140, CT ₄Be the thickness of the 4th lens 140, CT ₁Be the thickness of first lens 110, CT ₂Be the thickness of second lens 120.

When above-mentioned in satisfying (formula 3), the refracting power size configure of second lens 120 is balance comparatively, can effectively control the optical sensitive degree of image acquisition lens 10, and helps revising simultaneously the aberration of image acquisition lens 10, promotes image quality.Wherein, the optimum range of above-mentioned (formula 3) can be | f/f ₂|＜0.20.When above-mentioned in satisfying (formula 4), make aperture 100 have suitable position, in the heart far away and wide-angle characteristic, obtain best balance.When above-mentioned in satisfying (formula 5), make the 3rd lens thing side 131 and the 3rd lens have suitable radius-of-curvature, can help to strengthen its positive refracting power, further shorten image acquisition lens 10 total lengths as side 132.Wherein, the optimum range of above-mentioned (formula 5) can be 0.25＜(R ₅+ R ₆)/(R ₅-R ₆)＜0.55.When satisfying (formula 6), make the curvature of the 4th lens 140 be unlikely to too crooked, help revising higher order aberratons.When satisfying (formula 7), can help revising aberration.Wherein, the optimum range of above-mentioned (formula 7) can be 30＜V ₃-V ₄＜42.

When satisfying (formula 8), the mirror spacing of the thickness of the 4th lens 140 and the 3rd lens 130 and the 4th lens 140 is more suitable, can effectively shorten the optics total length.When satisfying (formula 9), first lens 110 and second lens 120 have best thickness respectively, help the assembled configuration of image acquisition lens 10.When satisfying (formula 10), can effectively revise aberration.

Wherein, the material of lens can be glass or plastics in the image acquisition lens 10.If the material of lens is a glass, then can increase the degree of freedom of image acquisition lens 10 refracting powers configuration.If the lens material is plastics, then can effectively reduce production costs.In addition, lens surface can be aspheric surface, and aspheric surface can be made into the shape beyond the sphere easily, obtains more control variable, in order to subduing aberration, and can effectively reduce the total length of image acquisition lens 10.

Moreover, in image acquisition lens 10,, represent that then lens surface is a convex surface in paraxial place if lens surface is a convex surface; If lens surface system representes then that for concave surface lens surface is a concave surface in paraxial place.

In addition,, can in image acquisition lens 10, insert at least one diaphragm, to get rid of parasitic light and to improve image quality or limit the imaging size of its object in response to user demand.Its diaphragm can be credit light diaphragm (Glare Stop) or field stop diaphragms such as (Field Stop), but not as limit.

According to the image acquisition lens that the utility model disclosed, will further describe concrete scheme with following each embodiment.Wherein, the definition of parameter is following among each embodiment: Fno is the f-number of image acquisition lens, and HFOV is the half the of maximum visual angle in the image acquisition lens.In addition, the aspheric surface described in each embodiment is capable of using but be not limited to following aspheric surface equation (formula ASP) expression:

X (Y) = (Y^{2} / R) / (1 + sqrt (1 - (1 + k) * {(Y / R)}^{2})) + \underset{i}{Σ} (Ai) * (Y^{i})

Wherein, X be on the aspheric surface apart from optical axis be Y selecting with aspheric optical axis on the relative height of summit tangent plane, Y be point on the aspheric curve apart from the distance of optical axis, k is a conical surface coefficient; Ai is an i rank asphericity coefficient, and i can be but is not limited to 4,6,8,10,12 and 14 in each embodiment.

< first embodiment >

Please, be the first example structure synoptic diagram according to the image acquisition lens that the utility model disclosed with reference to shown in Figure 1A.In the present embodiment, the wavelength that 10 of image acquisition lens are accepted light be with 587.6 nanometers (nanometer nm) is example, however above-mentioned wavelength can adjust according to the actual requirements, do not exceed with above-mentioned number of wavelengths value.

First lens 110 of present embodiment have negative refracting power, and second lens 120 have positive refracting power, and the 3rd lens 130 have positive refracting power, and the 4th lens 140 have negative refracting power.Wherein, the first lens thing side 111 is a concave surface, and the second lens thing side 121 is a concave surface, and second lens are convex surface as side 122, and the 3rd lens are convex surface as side 132, and the 4th lens thing side 141 is a concave surface, and the 4th lens are convex surface as side 142.Wherein, first lens 110 can have first point of inflexion, 113, the four lens 140 can have second point of inflexion 143, and aperture 100 can be arranged between first lens 110 and second lens 120.

The detailed data of image acquisition lens 10 is tabulated shown in the 1-1 as follows:

Table 1-1

1-1 can know that first lens, 110 to the 6th lens 160 all can be non-spherical lens from table, and can meet but be not limited to the aspheric surface of above-mentioned (formula ASP), about each aspheric parameter please with reference under the 1-2 that tabulates:

Table 1-2

In addition, from table 1-1, can extrapolate the described content of table 1-3:

Table 1-3

1-3 can know R by table ₁/ R ₂Meet (formula 1) scope.F/f ₃Meet (formula 2) scope.| f/f ₂|＜0.35 meets (formula 3) scope.SL/TTL meets (formula 4) scope.

(R ₅+ R ₆)/(R ₅-R ₆) meet (formula 5) scope.R ₇/ R ₈Meet (formula 6) scope.V ₃-V ₄Meet (formula 7) scope.T ₃₄/ CT ₄Meet (formula 8) scope.CT ₂/ CT ₁Meet (formula 9) scope.R ₇/ R ₆Meet (formula 10) scope.

Please with reference to shown in Figure 1B, be longitudinal spherical aberration (the Longitudinal Spherical Aberration) curve synoptic diagram that light for wavelength 486.1nm, 587.6nmm and 656.3nm is incident in the image acquisition lens that Figure 1A discloses.Wherein, the solid line L in Figure 1B drawing represents the light of wavelength 486.1nm.Dotted line M in Figure 1B drawing represents the light of wavelength 587.6nm.Dotted line N in Figure 1B drawing represents the light of wavelength 656.3nm.Horizontal ordinate is focal position (mm), and ordinate is the entrance pupil or the iris radius of standardization (Normalized).That is to say that can find out paraxial light (ordinate is near 0) and edge light (ordinate is near the 1) difference of focal position on imaging surface 160 respectively by the longitudinal spherical aberration curve, above-mentioned paraxial light and edge light all are parallel to optical axis.Can know that from Figure 1B no matter present embodiment image acquisition lens 10 is the light that receives wavelength 486.1nm, 587.6nm or 656.3nm, the longitudinal spherical aberration that image acquisition lens 10 is produced is all between between-the 0.01mm to 0.040mm.

After the content of second embodiment to the, eight embodiment that state; Among Fig. 2 B, Fig. 3 B, Fig. 4 B, Fig. 5 B, Fig. 6 B, Fig. 7 B and Fig. 8 B; Its represented longitudinal spherical aberration curve solid line L represents the light of wavelength 486.1nm, and dotted line M is wavelength 587.6nm, and dotted line N is wavelength 656.3nm; Be succinct length, so give unnecessary details no longer one by one.

Again please with reference to shown in Fig. 1 C, be the astigmatism curvature of field (the Astigmatic Field Curves) curve synoptic diagram that light for wavelength 587.6nm is incident in the image acquisition lens that Figure 1A discloses.Wherein, the astigmatism curvature of field curve of meridian ellipse (Tangential Plane) is to be the dotted line T in Fig. 1 C drawing.The astigmatism curvature of field curve of sagittal surface (Sagittal Plane) is to be the solid line S in the 1C figure drawing.Horizontal ordinate is the position (mm) of focus, and ordinate is image height (mm).That is to say, can find out meridian ellipse and sagittal surface difference because of the different focal positions of causing of curvature by astigmatism curvature of field curve.Can know that from Fig. 1 C the astigmatism curvature of field of the meridian ellipse that the light incident image acquisition lens 10 of wavelength 587.6nm is produced is between between the 0.0mm to 0.060mm, the astigmatism curvature of field of sagittal surface is between between-the 0.010mm to 0.025mm.

After the content of second embodiment to the, nine embodiment that state; In the astigmatism curvature of field curve synoptic diagram of Fig. 2 C, Fig. 3 C, Fig. 4 C, Fig. 5 C, Fig. 6 C, Fig. 7 C and Fig. 8 C; Its represented solid line S is the astigmatism curvature of field curve for sagittal surface; Dotted line T is the astigmatism curvature of field curve for meridian ellipse, is succinct length, so give unnecessary details no longer one by one.

Again please with reference to shown in Fig. 1 D, be distortion (Distortion) curve synoptic diagram that light for wavelength 587.6nm is incident in the image acquisition lens that Figure 1A discloses.Wherein, transverse axis is aberration rate (%), and Z-axis is image height (mm).That is to say, can find out the difference of aberration rate that different image height causes by distortion curve G.Can know that from Fig. 1 D the aberration rate that the light incident image acquisition lens 10 of wavelength 587.6nm is produced is between-1.5% to 0.0%.Shown in Figure 1B to Fig. 1 D, design according to above-mentioned first embodiment, image acquisition lens 10 can be revised various aberrations effectively.

After the content of second embodiment to the, eight embodiment that state; The distortion curve synoptic diagram of Fig. 2 D, Fig. 3 D, Fig. 4 D, Fig. 5 D, Fig. 6 D, Fig. 7 D and Fig. 8 D; Its represented solid line G is the distortion curve for the light of wavelength 587.6nm, is succinct length, so give unnecessary details no longer one by one.

Be noted that; Distortion that wavelength 486.1nm and 656.3nm light produce and astigmatism curvature of field curve are near distortion curve and the astigmatism curvature of field curve of wavelength 587.6nm; For avoiding the confusion of Fig. 1 C and Fig. 1 D accompanying drawing; In Fig. 1 C and Fig. 1 D figure, do not draw out distortion and astigmatism curvature of field curve that the light of wavelength 486.1nm and 656.3nm produces respectively, below second embodiment to the, eight embodiment also same.

< second embodiment >

Please, be the second example structure synoptic diagram according to the image acquisition lens that the utility model disclosed with reference to shown in Fig. 2 A.Its embodiment and aforementioned first embodiment are roughly the same; And the element described in the element described in second embodiment and first embodiment is identical; Its element number representes that it has identical functions or structure, for asking simplified illustration all with 2 beginnings as hundred bit digital; Only explain that below all the other exist together mutually and are not giving unnecessary details with regard to different part.

In the present embodiment, the wavelength that 20 of image acquisition lens are accepted light is to be example with 587.6nm, however above-mentioned wavelength can adjust according to the actual requirements, do not exceed with above-mentioned number of wavelengths value.

First lens 210 of present embodiment have negative refracting power, and second lens 220 have positive refracting power, and the 3rd lens 230 have positive refracting power, and the 4th lens 240 have negative refracting power.Wherein, the first lens thing side 211 is a concave surface,, the second lens thing side 221 is a concave surface, and second lens are convex surface as side 222, and the 3rd lens are convex surface as side 232, and the 4th lens thing side 241 is a concave surface, the 4th lens are convex surface as side 242.Wherein, first lens 210 can have first point of inflexion, 213, the four lens 240 can have second point of inflexion 243, and aperture 200 can be arranged between first lens 210 and second lens 220.

The detailed data of image acquisition lens 20 is tabulated shown in the 2-1 as follows:

Table 2-1

2-1 can know that first lens, 210 to the 6th lens 260 all can be non-spherical lens from table, and can meet but be not limited to the aspheric surface of above-mentioned (formula ASP), about each aspheric parameter please with reference under the 2-2 that tabulates:

Table 2-2

In addition, from table 2-1, can extrapolate the described content of table 2-3:

Table 2-3

Please with reference to shown in Fig. 2 B, be the longitudinal spherical aberration curve synoptic diagram that light for wavelength 486.1nm, 587.6nm and 656.3nm is incident in the image acquisition lens that Fig. 2 A disclosed.Can know that from Fig. 2 B no matter in the present embodiment be the light that receives wavelength 486.1nm, 587.6nm or 656.3nm, the longitudinal spherical aberration that image acquisition lens 20 is produced is all between between-the 0.010mm to 0.040mm.

Again please with reference to shown in Fig. 2 C, be the astigmatism curvature of field curve synoptic diagram that light for wavelength 587.6nm is incident in the image acquisition lens that Fig. 2 A disclosed.Can know that from Fig. 2 C the meridian ellipse astigmatism curvature of field that the light incident image acquisition lens 20 of wavelength 587.6nm is produced is between between the 0.0mm to 0.100mm, the sagittal surface astigmatism curvature of field is between between the 0.0mm to 0.040mm.

Again please with reference to shown in Fig. 2 D, be the distortion curve synoptic diagram that light for wavelength 587.6nm is incident in the image acquisition lens that Fig. 2 A disclosed.Can know that from Fig. 2 D the aberration rate that the light incident image acquisition lens 20 of wavelength 587.6nm is produced is between-1.5% to 0.0%.Of Fig. 2 B to Fig. 2 D, design according to above-mentioned second embodiment, the image acquisition lens 20 that the utility model disclosed can be revised various aberrations effectively.

< the 3rd embodiment >

, be to be the 3rd example structure synoptic diagram please according to the image acquisition lens that the utility model disclosed with reference to shown in Fig. 3 A.Its embodiment and aforementioned first embodiment are roughly the same; And the element described in the element described in the 3rd embodiment and first embodiment is identical; Its element number representes that it has identical functions or structure, for asking simplified illustration all with 3 beginnings as hundred bit digital; Only explain that below all the other exist together mutually and are not giving unnecessary details with regard to different part.

In the present embodiment, the wavelength that 30 of image acquisition lens are accepted light is to be example with 587.6nm, however above-mentioned wavelength can adjust according to the actual requirements, do not exceed with above-mentioned number of wavelengths value.

First lens 310 of present embodiment have negative refracting power, and second lens 320 have positive refracting power, and the 3rd lens 330 have positive refracting power, and the 4th lens 340 have negative refracting power.Wherein, the first lens thing side 311 is a concave surface, and the second lens thing side 321 is a concave surface, and second lens are convex surface as side 322, and the 3rd lens are convex surface as side 332, and the 4th lens thing side 341 is a concave surface, and the 4th lens are convex surface as side 342.Wherein, first lens 310 can have first point of inflexion, 313, the four lens 340 can have second point of inflexion 343, and aperture 300 can be arranged between first lens 310 and second lens 320.

The detailed data of image acquisition lens 30 is tabulated shown in the 3-1 as follows:

Table 3-1

3-1 can know that first lens, 320 to the 6th lens 360 all can be non-spherical lens from table, and can meet but be not limited to the aspheric surface of above-mentioned (formula ASP), about each aspheric parameter please with reference under the 3-2 that tabulates:

Table 3-2

In addition, from table 3-1, can extrapolate the described content of table 3-3:

Table 3-3

Please with reference to shown in Fig. 3 B, be the longitudinal spherical aberration curve synoptic diagram that light for wavelength 486.1nm, 587.6nm and 656.3nm is incident in the image acquisition lens that Fig. 3 A disclosed.Can know that from Fig. 3 B no matter in the present embodiment be the light that receives wavelength 486.1nm, 587.6nm or 656.3nm, the longitudinal spherical aberration that image acquisition lens 30 is produced is all between between-the 0.010mm to 0.040mm.

Again please with reference to shown in Fig. 3 C, be the astigmatism curvature of field curve synoptic diagram that light for wavelength 587.6nm is incident in the image acquisition lens that Fig. 3 A disclosed.Can know that from Fig. 3 C the meridian ellipse astigmatism curvature of field that the light incident image acquisition lens 30 of wavelength 587.6nm is produced is between between the 0.0mm to 0.100mm, the sagittal surface astigmatism curvature of field is between between the 0.0mm to 0.040mm.

Again please with reference to shown in Fig. 3 D, be the distortion curve synoptic diagram that light for wavelength 587.6nm is incident in the image acquisition lens that Fig. 3 A disclosed.Can know that from Fig. 3 D the aberration rate that the light incident image acquisition lens 30 of wavelength 587.6nm is produced is between-1.5% to 0.0%.Of Fig. 3 B to Fig. 3 D, design according to above-mentioned the 3rd embodiment, the image acquisition lens 30 that the utility model disclosed can be revised various aberrations effectively.

< the 4th embodiment >

, be to be the 4th example structure synoptic diagram please according to the image acquisition lens that the utility model disclosed with reference to shown in Fig. 4 A.Its embodiment and aforementioned first embodiment are roughly the same; And the element described in the element described in the 4th embodiment and first embodiment is identical; Its element number representes that it has identical functions or structure, for asking simplified illustration all with 4 beginnings as hundred bit digital; Only explain that below all the other exist together mutually and are not giving unnecessary details with regard to different part.

In the present embodiment, the wavelength that 40 of image acquisition lens are accepted light is to be example with 587.6nm, however above-mentioned wavelength can adjust according to the actual requirements, do not exceed with above-mentioned number of wavelengths value.

First lens 410 of present embodiment have negative refracting power, and second lens 420 have positive refracting power, and the 3rd lens 430 have positive refracting power, and the 4th lens 440 have negative refracting power.Wherein, the first lens thing side 411 is a concave surface, and the second lens thing side 421 is a concave surface, and second lens are convex surface as side 422, and the 3rd lens are convex surface as side 432, and the 4th lens thing side 441 is a concave surface, and the 4th lens are convex surface as side 442.Wherein, first lens 410 can have first point of inflexion, 413, the four lens 440 can have second point of inflexion 443, and aperture 400 can be arranged between first lens 410 and second lens 420.

The detailed data of image acquisition lens 40 is tabulated shown in the 4-1 as follows:

Table 4-1

4-1 can know that first lens, 410 to the 6th lens 460 all can be non-spherical lens from table, and can meet but be not limited to the aspheric surface of above-mentioned (formula ASP), about each aspheric parameter please with reference under the 4-2 that tabulates:

Table 4-2

In addition, from table 4-1, can extrapolate the described content of table 4-3:

Table 4-3

Please with reference to shown in Fig. 4 B, be the longitudinal spherical aberration curve synoptic diagram that light for wavelength 486.1nm, 587.6nm and 656.3nm is incident in the image acquisition lens that Fig. 4 A disclosed.Can know that from Fig. 4 B no matter be the light that receives wavelength 486.1nm, 587.6nm or 656.3nm in the present embodiment, the longitudinal spherical aberration that image acquisition lens 40 is produced is all between between the 0.0mm to 0.040mm.

Again please with reference to shown in Fig. 4 C, be the astigmatism curvature of field curve synoptic diagram that light for wavelength 587.6nm is incident in the image acquisition lens that Fig. 4 A disclosed.Can know that from Fig. 4 C the meridian ellipse astigmatism curvature of field that the light incident image acquisition lens 40 of wavelength 587.6nm is produced is between between the 0.0mm to 0.090mm, the sagittal surface astigmatism curvature of field is between between the 0.0mm to 0.040mm.

Again please with reference to shown in Fig. 4 D, be the distortion curve synoptic diagram that light for wavelength 587.6nm is incident in the image acquisition lens that Fig. 4 A disclosed.Can know that from Fig. 4 D the aberration rate that the light incident image acquisition lens 40 of wavelength 587.6nm is produced is between-1.5% to 0.1%.Of Fig. 4 B to Fig. 4 D, design according to above-mentioned the 4th embodiment, the image acquisition lens 40 that the utility model disclosed can be revised various aberrations effectively.

< the 5th embodiment >

, be to be the 5th example structure synoptic diagram please according to the image acquisition lens that the utility model disclosed with reference to shown in Fig. 5 A.Its embodiment and aforementioned first embodiment are roughly the same; And the element described in the element described in the 5th embodiment and first embodiment is identical; Its element number representes that it has identical functions or structure, for asking simplified illustration all with 5 beginnings as hundred bit digital; Only explain that below all the other exist together mutually and are not giving unnecessary details with regard to different part.

In the present embodiment, the wavelength that 50 of image acquisition lens are accepted light is to be example with 587.6nm, however above-mentioned wavelength can adjust according to the actual requirements, do not exceed with above-mentioned number of wavelengths value.

First lens 510 of present embodiment have negative refracting power, and second lens 520 have positive refracting power, and the 3rd lens 530 have positive refracting power, and the 4th lens 540 have negative refracting power.Wherein, the first lens thing side 511 is a concave surface, and the second lens thing side 521 is a concave surface, and second lens are convex surface as side 522, and the 3rd lens are convex surface as side 532, and the 4th lens thing side 541 is a concave surface, and the 4th lens are convex surface as side 542.Wherein, first lens 510 can have first point of inflexion, 513, the four lens 540 can have second point of inflexion 543, and aperture 500 can be arranged between first lens 510 and second lens 520.

The detailed data of image acquisition lens 50 is tabulated shown in the 5-1 as follows:

Table 5-1

5-1 can know that first lens, 510 to the 6th lens 560 all can be non-spherical lens from table, and can meet but be not limited to the aspheric surface of above-mentioned (formula ASP), about each aspheric parameter please with reference under the 5-2 that tabulates:

Table 5-2

In addition, from table 5-1, can extrapolate the described content of table 5-3:

Table 5-3

Please with reference to shown in Fig. 5 B, be the longitudinal spherical aberration curve synoptic diagram that light for wavelength 486.1nm, 587.6nm and 656.3nm is incident in the image acquisition lens that Fig. 5 A disclosed.Can know that from Fig. 5 B no matter in the present embodiment be the light that receives wavelength 486.1nm, 587.6nm or 656.3nm, the longitudinal spherical aberration that image acquisition lens 50 is produced is all between between-the 0.005mm to 0.040mm.

Again please with reference to shown in Fig. 5 C, be the astigmatism curvature of field curve synoptic diagram that light for wavelength 587.6nm is incident in the image acquisition lens that Fig. 5 A disclosed.Can know that from Fig. 5 C the meridian ellipse astigmatism curvature of field that the light incident image acquisition lens 50 of wavelength 587.6nm is produced is between between the 0.0mm to 0.060mm, the sagittal surface astigmatism curvature of field is between between the 0.0mm to 0.030mm.

Again please with reference to shown in Fig. 5 D, be the distortion curve synoptic diagram that light for wavelength 587.6nm is incident in the image acquisition lens that Fig. 5 A disclosed.Can know that from Fig. 5 D the aberration rate that the light incident image acquisition lens 50 of wavelength 587.6nm is produced is between-1.5% to 0.1%.Of Fig. 5 B to Fig. 5 D, design according to above-mentioned the 5th embodiment, the image acquisition lens 50 that the utility model disclosed can be revised various aberrations effectively.

< the 6th embodiment >

, be to be the 6th example structure synoptic diagram please according to the image acquisition lens that the utility model disclosed with reference to shown in Fig. 6 A.Its embodiment and aforementioned first embodiment are roughly the same; And the element described in the element described in the 6th embodiment and first embodiment is identical; Its element number representes that it has identical functions or structure, for asking simplified illustration all with 6 beginnings as hundred bit digital; Only explain that below all the other exist together mutually and are not giving unnecessary details with regard to different part.

In the present embodiment, the wavelength that 60 of image acquisition lens are accepted light is to be example with 587.6nm, however above-mentioned wavelength can adjust according to the actual requirements, do not exceed with above-mentioned number of wavelengths value.

First lens 610 of present embodiment have negative refracting power, and second lens 620 have positive refracting power, and the 3rd lens 630 have positive refracting power, and the 4th lens 640 have negative refracting power.Wherein, the first lens thing side 611 is a concave surface, and the second lens thing side 621 is a concave surface, and second lens are convex surface as side 622, and the 3rd lens are convex surface as side 632, and the 4th lens thing side 641 is a concave surface, and the 4th lens are convex surface as side 642.Wherein, first lens 610 can have first point of inflexion, 613, the four lens 640 can have second point of inflexion 643, and aperture 600 can be arranged between first lens 610 and second lens 620.

The detailed data of image acquisition lens 60 is tabulated shown in the 6-1 as follows:

Table 6-1

6-1 can know that first lens, 610 to the 6th lens 660 all can be non-spherical lens from table, and can meet but be not limited to the aspheric surface of above-mentioned (formula ASP), about each aspheric parameter please with reference under the 6-2 that tabulates:

Table 6-2

In addition, from table 6-1, can extrapolate the described content of table 6-3:

Table 6-3

Please with reference to shown in Fig. 6 B, be the longitudinal spherical aberration curve synoptic diagram that light for wavelength 486.1nm, 587.6nm and 656.3nm is incident in the image acquisition lens that Fig. 6 A disclosed.Can know that from Fig. 6 B no matter in the present embodiment be the light that receives wavelength 486.1nm, 587.6nm or 656.3nm, the longitudinal spherical aberration that image acquisition lens 60 is produced is all between between-the 0.010mm to 0.050mm.

Again please with reference to shown in Fig. 6 C, be the astigmatism curvature of field curve synoptic diagram that light for wavelength 587.6nm is incident in the image acquisition lens that Fig. 6 A disclosed.Can know that from Fig. 6 C the meridian ellipse astigmatism curvature of field that the light incident image acquisition lens 60 of wavelength 587.6nm is produced is between between-the 0.010mm to 0.12mm, the sagittal surface astigmatism curvature of field is between between-the 0.025mm to 0.025mm.

Again please with reference to shown in Fig. 6 D, be the distortion curve synoptic diagram that light for wavelength 587.6nm is incident in the image acquisition lens that Fig. 6 A disclosed.Can know that from Fig. 6 D the aberration rate that the light incident image acquisition lens 60 of wavelength 587.6nm is produced is between-1.5% to 0.5%.Of Fig. 6 B to Fig. 6 D, design according to above-mentioned the 6th embodiment, the image acquisition lens 60 that the utility model disclosed can be revised various aberrations effectively.

< the 7th embodiment >

, be to be the 7th example structure synoptic diagram please according to the image acquisition lens that the utility model disclosed with reference to shown in Fig. 7 A.Its embodiment and aforementioned first embodiment are roughly the same; And the element described in the element described in the 7th embodiment and first embodiment is identical; Its element number representes that it has identical functions or structure, for asking simplified illustration all with 7 beginnings as hundred bit digital; Only explain that below all the other exist together mutually and are not giving unnecessary details with regard to different part.

In the present embodiment, the wavelength that 70 of image acquisition lens are accepted light is to be example with 587.6nm, however above-mentioned wavelength can adjust according to the actual requirements, do not exceed with above-mentioned number of wavelengths value.

First lens 710 of present embodiment have negative refracting power, and second lens 720 have positive refracting power, and the 3rd lens 730 have positive refracting power, and the 4th lens 740 have negative refracting power.Wherein, the first lens thing side 711 is a concave surface, and the second lens thing side 721 is a concave surface, and second lens are convex surface as side 722, and the 3rd lens are convex surface as side 732, and the 4th lens thing side 741 is a concave surface, and the 4th lens are convex surface as side 742.Wherein, first lens 710 can have first point of inflexion, 713, the four lens 740 can have second point of inflexion 743, and aperture 700 can be arranged between first lens 710 and second lens 720.

The detailed data of image acquisition lens 70 is tabulated shown in the 7-1 as follows:

Table 7-1

7-1 can know that first lens, 720 to the 6th lens 760 all can be non-spherical lens from table, and can meet but be not limited to the aspheric surface of above-mentioned (formula ASP), about each aspheric parameter please with reference under the 7-2 that tabulates:

Table 7-2

In addition, from table 7-1, can extrapolate the described content of table 7-3:

Table 7-3

Please with reference to shown in Fig. 7 B, be the longitudinal spherical aberration curve synoptic diagram that light for wavelength 486.1nm, 587.6nm and 656.3nm is incident in the image acquisition lens that Fig. 7 A disclosed.Can know that from Fig. 7 B no matter in the present embodiment be the light that receives wavelength 486.1nm, 587.6nm or 656.3nm, the longitudinal spherical aberration that image acquisition lens 70 is produced is all between between-the 0.015mm to 0.040mm.

Again please with reference to shown in Fig. 7 C, be the astigmatism curvature of field curve synoptic diagram that light for wavelength 587.6nm is incident in the image acquisition lens that Fig. 7 A disclosed.Can know that from Fig. 7 C the meridian ellipse astigmatism curvature of field that the light incident image acquisition lens 70 of wavelength 587.6nm is produced is between between-the 0.030mm to 0.060mm, the sagittal surface astigmatism curvature of field is between between-the 0.025mm to 0.025mm.

Again please with reference to shown in Fig. 7 D, be the distortion curve synoptic diagram that light for wavelength 587.6nm is incident in the image acquisition lens that Fig. 7 A disclosed.Can know that from Fig. 7 D the aberration rate that the light incident image acquisition lens 30 of wavelength 587.6nm is produced is between-1.5% to 0.5%.Of Fig. 7 B to Fig. 7 D, design according to above-mentioned the 7th embodiment, the image acquisition lens 70 that the utility model disclosed can be revised various aberrations effectively.

< the 8th embodiment >

, be to be the 8th example structure synoptic diagram please according to the image acquisition lens that the utility model disclosed with reference to shown in Fig. 8 A.Its embodiment and aforementioned first embodiment are roughly the same; And the element described in the element described in the 8th embodiment and first embodiment is identical; Its element number representes that it has identical functions or structure, for asking simplified illustration all with 8 beginnings as hundred bit digital; Only explain that below all the other exist together mutually and are not giving unnecessary details with regard to different part.

In the present embodiment, the wavelength that 80 of image acquisition lens are accepted light is to be example with 587.6nm, however above-mentioned wavelength can adjust according to the actual requirements, do not exceed with above-mentioned number of wavelengths value.

First lens 810 of present embodiment have negative refracting power, and second lens 820 have negative refracting power, and the 3rd lens 830 have positive refracting power, and the 4th lens 840 have negative refracting power.Wherein, the first lens thing side 811 is a concave surface, and the second lens thing side 821 is a concave surface, and second lens are convex surface as side 822, and the 3rd lens are convex surface as side 832, and the 4th lens thing side 841 is a concave surface, and the 4th lens are convex surface as side 842.Wherein, first lens 810 can have first point of inflexion, 813, the four lens 840 can have second point of inflexion 843, and aperture 800 can be arranged between first lens 810 and second lens 820.

The detailed data of image acquisition lens 80 is tabulated shown in the 8-1 as follows:

Table 8-1

8-1 can know that first lens, 810 to the 6th lens 860 all can be non-spherical lens from table, and can meet but be not limited to the aspheric surface of above-mentioned (formula ASP), about each aspheric parameter please with reference under the 8-2 that tabulates:

Table 8-2

In addition, from table 8-1, can extrapolate the described content of table 8-3:

Table 8-3

Please with reference to shown in Fig. 8 B, be the longitudinal spherical aberration curve synoptic diagram that light for wavelength 486.1nm, 587.6nm and 656.3nm is incident in the image acquisition lens that Fig. 8 A disclosed.Can know that from Fig. 8 B no matter in the present embodiment be the light that receives wavelength 486.1nm, 587.6nm or 656.3nm, the longitudinal spherical aberration that image acquisition lens 80 is produced is all between between-the 0.015mm to 0.040mm.

Again please with reference to shown in Fig. 8 C, be the astigmatism curvature of field curve synoptic diagram that light for wavelength 587.6nm is incident in the image acquisition lens that Fig. 8 A disclosed.Can know that from Fig. 8 C the meridian ellipse astigmatism curvature of field that the light incident image acquisition lens 80 of wavelength 587.6nm is produced is between between the 0.0mm to 0.050mm, the sagittal surface astigmatism curvature of field is between between-the 0.010mm to 0.025mm.

Again please with reference to shown in Fig. 8 D, be the distortion curve synoptic diagram that light for wavelength 587.6nm is incident in the image acquisition lens that Fig. 8 A disclosed.Can know that from Fig. 8 D the aberration rate that the light incident image acquisition lens 80 of wavelength 587.6nm is produced is between-1.5% to 0.1%.Of Fig. 8 B to Fig. 8 D, design according to above-mentioned the 8th embodiment, the image acquisition lens 80 that the utility model disclosed can be revised various aberrations effectively.

Certainly; The utility model also can have other various embodiments; Under the situation that does not deviate from the utility model spirit and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the utility model.

Claims

1. an image acquisition lens is characterized in that, along the thing side of an optical axis to comprising in regular turn as side:

One aperture; And

One has the 3rd lens of positive refracting power; And

-3.0＜R ₁/ R ₂＜0.9; And

1.2＜f/f ₃＜2.0。

2. image acquisition lens according to claim 1; It is characterized in that, the 3rd lens be convex surface as the side, the thing side of the 4th lens and the 4th lens be aspheric surface as the side; The 4th lens have at least one point of inflexion, and the 4th lens are plastic lens.

3. image acquisition lens according to claim 2 is characterized in that, the thing side of the 3rd lens has a radius of curvature R ₅, the 3rd lens have a radius of curvature R as the side ₆, this image acquisition lens satisfies following formula: 0.1＜(R ₅+ R ₆)/(R ₅-R ₆)＜0.8.

4. image acquisition lens according to claim 3 is characterized in that, the thing side of the 4th lens has a radius of curvature R ₇, the 4th lens have a radius of curvature R as the side ₈, this image acquisition lens satisfies following formula: 0.1＜R ₇/ R ₈＜0.8.

5. image acquisition lens according to claim 4 is characterized in that, the 3rd lens have a chromatic dispersion coefficient V ₃, the 4th lens have a chromatic dispersion coefficient V ₄, this image acquisition lens satisfies following formula: 23＜V ₃-V ₄＜45.

6. image acquisition lens according to claim 3 is characterized in that, on this optical axis, has a mirror spacing T between the 3rd lens and the 4th lens ₃₄, the 4th lens have a thickness C T ₄, this image acquisition lens satisfies following formula: 0.15＜T ₃₄/ CT ₄＜1.5.

7. image acquisition lens according to claim 3 is characterized in that, on this optical axis, this image acquisition lens has a focal distance f, and these second lens have a focal distance f ₂, this image acquisition lens satisfies following formula: | f/f ₂|＜0.20.

8. image acquisition lens according to claim 3; It is characterized in that; This image acquisition lens also includes an imaging surface, and on this optical axis, this aperture to this imaging surface has one apart from SL; The thing side of these first lens to this imaging surface has one apart from TTL, and this image acquisition lens satisfies following formula: 0.5＜SL/TTL＜0.9.

9. image acquisition lens according to claim 3 is characterized in that, the 3rd lens have a chromatic dispersion coefficient V ₃, the 4th lens have a chromatic dispersion coefficient V ₄, this image acquisition lens satisfies following formula: 30＜V ₃-V ₄＜42.

10. image acquisition lens according to claim 4 is characterized in that, on this optical axis, these first lens have a thickness C T ₁, these second lens have a thickness C T ₂, this image acquisition lens satisfies following formula: 0.2＜CT ₂/ CT ₁＜1.0.

11. image acquisition lens according to claim 4 is characterized in that, the thing side of these first lens has a radius of curvature R ₁, these first lens have a radius of curvature R as the side ₂, this image acquisition lens satisfies following formula :-1.1＜R ₁/ R ₂＜0.7.

12. image acquisition lens according to claim 2 is characterized in that, the thing side of the 3rd lens has a radius of curvature R ₅, the 3rd lens have a radius of curvature R as the side ₆, this image acquisition lens satisfies following formula: 0.25＜(R ₅+ R ₆)/(R ₅-R ₆)＜0.55.

13. image acquisition lens according to claim 1 is characterized in that, these first lens have at least one point of inflexion.

14. image acquisition lens according to claim 1 is characterized in that, the 3rd lens have a radius of curvature R as the side ₆, the thing side of the 4th lens has a radius of curvature R ₇, this image acquisition lens satisfies following formula: 0.3＜R ₇/ R ₆＜0.8.

15. an image acquisition lens is characterized in that, along the thing side of an optical axis to comprising in regular turn as side:

One second lens, the thing side of these second lens is a concave surface;

One has the 3rd lens of positive refracting power; And

-3.0＜R ₁/R ₂＜0.9；

| f/f ₂|＜0.35; And

0.5＜SL/TTL＜0.9。

16. image acquisition lens according to claim 15 is characterized in that, the thing side of the 4th lens is a concave surface, the 4th lens be convex surface as the side, the thing side of the 4th lens and the 4th lens be aspheric surface as the side.

17. image acquisition lens according to claim 16 is characterized in that, these second lens be convex surface as the side.

18. image acquisition lens according to claim 17 is characterized in that, the 4th lens have at least one point of inflexion.

19. image acquisition lens according to claim 18 is characterized in that, the thing side of the 3rd lens has a radius of curvature R ₅, the 3rd lens have a radius of curvature R as the side ₆, this image acquisition lens satisfies following formula: 0.1＜(R ₅+ R ₆)/(R ₅-R ₆)＜0.8.

20. image acquisition lens according to claim 18 is characterized in that, the 3rd lens have a chromatic dispersion coefficient V ₃, the 4th lens have a chromatic dispersion coefficient V ₄, this image acquisition lens satisfies following formula: 23＜V ₃-V ₄＜45.

21. image acquisition lens according to claim 19 is characterized in that, the 3rd lens have a radius of curvature R as the side ₆, the thing side of the 4th lens has a radius of curvature R ₇, this image acquisition lens satisfies following formula: 0.3＜R ₇/ R ₆＜0.8.

22. image acquisition lens according to claim 20 is characterized in that, these second lens have positive refracting power.

23. image acquisition lens according to claim 20 is characterized in that, the thing side of the 3rd lens has a radius of curvature R ₅, the 3rd lens have a radius of curvature R as the side ₆, this image acquisition lens satisfies following formula: 0.25＜(R ₅+ R ₆)/(R ₅-R ₆)＜0.55.